STM32W108CB datasheet(118/278 Pages) STMICROELECTRONICS

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Serial interfaces

STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

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Doc ID 16252 Rev 14

9.5.3

Interrupts

I2C master controller interrupts are generated on the following events:

●

Bus command (START/STOP) completed (0 to 1 transition of CMDFIN)

●

Character transmitted and slave device responded with NACK

●

Character transmitted (0 to 1 transition of BTF)

●

Character received (0 to 1 transition of BRF)

●

Received and lost character while receive FIFO was full (receive overrun error)

●

Transmitted character while transmit FIFO was empty (transmit underrun error)

To enable CPU interrupts, set the desired interrupt bits in the second level SCx_IER register.

9.6

Universal asynchronous receiver/transmitter (UART)

The SC1 UART is enabled by writing 1 to SC1_CR. The SC2 serial controller does not

include UART functions.

The UART supports the following features:

●

Flexible baud rate clock (300 bps to 921.6 bps)

●

Data bits (7 or 8)

●

Parity bits (none, odd, or even)

●

Stop bits (1 or 2)

●

False start bit and noise filtering

●

Receive and transmit FIFOs

●

Optional RTS/CTS flow control

●

Receive and transmit DMA channels

The UART uses two signals to transmit and receive serial data:

●

TXD (Transmitted Data) - serial data received by the STM32W108

●

RXD (Received Data) - serial data sent by the STM32W108

If RTS/CTS flow control is enabled, these two signals are also used:

●

nRTS (Request To Send) - indicates the STM32W108 is able to receive data RXD

●

nCTS (Clear To Send) - inhibits sending data from the STM32W108 if not asserted

The GPIO pins assigned to these signals are shown in Table 28.

Direction

GPIO configuration

SC1 pin

Table 28.

UART GPIO usage

Parameter

TXD

RXD

nCTS(1)

Only used if RTS/CTS hardware flow control is enabled.

nRTS(1)

Output

Input

Output

Alternate Output

(push-pull)

Input

Alternate Output

(push-pull)

PB1

PB2

PB3

PB4

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